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Analog Devices Inc. LTC3374EFE#PBF
- Part No.:
- LTC3374EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3374EFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LTC3374EFE#PBF from Analog Devices (formerly Linear Technology) is an 8-channel, 1A-per-channel synchronous buck DC/DC regulator IC with independent input supplies (2.25V–5.5V), programmable 1MHz–3MHz switching frequency, and master-slave parallel configuration support up to 4A per output. It integrates die temperature monitoring, precision enable thresholds for autonomous power-up sequencing, and phased 90° switching to reduce input ripple-used in multirail industrial and automotive power systems.
For engineers reviewing the LTC3374EFE#PBF datasheet, LTC3374EFE#PBF pinout, LTC3374EFE#PBF application, or LTC3374EFE#PBF equivalent, key selection criteria include per-channel VIN independence, thermal-aware operation via TEMP pin, PGOOD_ALL fault reporting, forced continuous/Burst Mode selection via MODE pin, and TSSOP-38 package compatibility with legacy PCB layouts.
Technical Context
The LTC3374EFE#PBF implements eight fully independent synchronous buck regulators, each with internal PMOS/NMOS switches (300mΩ RDS(ON) typ), 0.8V–VIN output range, and individual EN/FB/VIN/SW pins. All channels share a common oscillator whose frequency is set by RT resistor, external SYNC clock, or internal 2MHz default.
Operating mode (Burst Mode® or forced continuous) is globally controlled by the MODE pin; PGOOD_ALL provides open-drain fault indication across all enabled regulators; TEMP pin delivers a linear 6.75mV/°C analog voltage proportional to die temperature, referenced to 150mV at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel count | 8 independent 1A synchronous buck regulators, configurable as 1–4 parallel groups per output rail |
| Input voltage range | 2.25V to 5.5V per channel-supports mixed-rail systems with separate supply domains |
| Output voltage range | 0.8V to VIN-enables low-voltage core rails (e.g., 0.8V, 1.2V, 1.8V) with standard resistor feedback |
| Switching frequency | 1MHz to 3MHz (programmable via RT); 2MHz default-balances efficiency, size, and EMI in compact designs |
| Thermal monitoring | TEMP pin outputs 150mV @ 25°C + 6.75mV/°C-enables real-time die temperature tracking without external sensor |
| Enable threshold accuracy | VEN_HI = 400mV (typ), ±60mV hysteresis-ensures reliable, noise-immune power sequencing across all 8 channels |
| Package | 38-lead plastic TSSOP, –40°C to +125°C operating junction temperature-pin-compatible with legacy board footprints |
Pinout & Package
Package: 38-lead plastic TSSOP (FE package), exposed pad (Pin 39) connected to GND for thermal and electrical performance. Pin pitch: 0.5mm. Dimensions: 12.5mm × 6.1mm × 1.1mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1–EN8 (Pins 3,2,17,16,22,21,36,35) | Per-channel enable inputs | Active-high logic; precise 400mV threshold enables deterministic multi-rail startup sequencing |
| FB1–FB8 (Pins 4,9,10,15,23,28,29,34) | Per-channel feedback inputs | 0.8V reference; connects to resistor divider for output voltage setting-shorting FBx to VINx configures master-slave parallel operation |
| VIN1–VIN8 (Pins 5,8,11,14,24,27,30,33) | Per-channel input supplies | Independent 2.25V–5.5V inputs allow heterogeneous rail sourcing (e.g., battery, LDO, secondary converter) |
| SW1–SW8 (Pins 6,7,12,13,25,26,31,32) | Per-channel switch nodes | Connects to external inductor; supports phase interleaving (90° offset) to reduce input capacitor RMS current |
| PGOOD_ALL (Pin 18) | Global power-good status | Open-drain output pulled low if any enabled regulator's output drops >7.5% below target-simplifies system-level fault detection |
| TEMP (Pin 1) | Digital die temperature monitor | Analog voltage output (150mV @ 25°C, 6.75mV/°C slope) enables thermal margining and overtemperature warning before shutdown |
| MODE (Pin 37) | Global operating mode control | Low = Burst Mode® (high light-load efficiency); High = forced continuous (low-noise, fixed-frequency PWM) |
| SYNC (Pin 19) | External clock synchronization input | Accepts 1MHz–3MHz square wave; automatically adjusts slope compensation-critical for EMI-sensitive or synchronized multi-IC systems |
| RT (Pin 20) | Oscillator frequency programming | Resistor-to-GND sets fSW; tie to VCC for 2MHz default-enables precise frequency tuning without crystal |
| VCC (Pin 38) | Internal bias supply | 2.7V–5.5V input; powers internal circuitry-requires ≥10µF ceramic bypass to GND for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| 8× independent 1A buck regulators | Enables single-chip power delivery for complex SoC/FPGA platforms with multiple voltage domains and sequencing requirements |
| Master-slave parallel configuration (up to 4A/output) | Reduces component count and board area vs discrete solutions-shared inductor design lowers BOM cost and improves current sharing accuracy |
| Phased 90° switching across channels | Reduces input capacitor RMS current by up to 30% vs non-interleaved operation-extends capacitor lifetime and lowers EMI filter size |
| Precision enable thresholds with hysteresis | Supports robust, repeatable power-up sequencing across 8 rails without external supervisors-eliminates need for discrete sequencers |
| Integrated die temperature monitor (TEMP pin) | Provides real-time thermal telemetry for dynamic thermal management-avoids costly external sensors and ADC channels |
| Burst Mode® and forced continuous mode selection | Optimizes efficiency at light loads (Burst Mode®) or minimizes output ripple/noise at light loads (forced continuous)-user-selectable per system requirement |
Applications
| Industrial PLC Power Management | Automotive ADAS Domain Controller |
|---|---|
Use Scenario: Powering FPGA I/O banks, ARM cores, memory interfaces, and CAN transceivers in a DIN-rail mounted controller with strict thermal and reliability requirements. IC Role / Device Role / Timing Role: Primary multirail DC/DC regulator delivering 0.85V (core), 1.2V (memory), 1.8V (I/O), and 3.3V (peripherals) from a 5V intermediate bus. Use Value: Independent VIN pins allow direct connection to isolated 5V/3.3V rails; PGOOD_ALL simplifies system reset assertion; TEMP pin enables predictive thermal throttling. |
Use Scenario: Supplying vision processor, radar SoC, and sensor interface ICs in a front-camera ECU where EMI, thermal headroom, and functional safety are critical. IC Role / Device Role / Timing Role: Central power management IC generating 0.8V (CPU), 1.1V (GPU), 1.8V (MIPI), and 3.3V (sensor bias) with tight sequencing and fault reporting. Use Value: 90° phase interleaving reduces conducted EMI into camera signal lines; MODE pin allows forced continuous mode during image capture to minimize ripple-induced noise. |
| Communications Baseband Unit | Test & Measurement Equipment |
Use Scenario: Providing clean, sequenced voltages to multi-core baseband processors, RF front-end bias rails, and high-speed SerDes in 5G small-cell radios. IC Role / Device Role / Timing Role: Eight-channel regulator supporting dynamic voltage scaling (DVS) across processing clusters and RF subsystems with independent enable control. Use Value: Per-channel EN pins enable software-controlled rail enable/disable for power optimization; RT/SYNC flexibility supports EMI compliance testing at multiple frequencies. |
Use Scenario: Powering mixed-signal ASICs, precision DACs/ADCs, and FPGA-based logic analyzers requiring ultra-low-noise, thermally stable supplies. IC Role / Device Role / Timing Role: Precision multirail source delivering 1.2V (analog core), 1.8V (digital I/O), 2.5V (reference), and 5V (front-panel) with <±1% regulation and thermal derating visibility. Use Value: TEMP pin enables real-time correlation of supply drift with die temperature; forced continuous mode ensures sub-10mVpp ripple on sensitive analog rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3374HUFE#PBF | Same architecture and pinout; rated for –40°C to +150°C junction temperature (vs. +125°C for LTC3374EFE#PBF) | Required for under-hood automotive or high-ambient industrial environments exceeding 125°C ambient | Select when extended temperature qualification and higher thermal derating margin are mandatory |
| LTC3374EFE#TRPBF | Identical electrical and thermal specs; supplied in tape-and-reel (2,500 pcs) vs. tube (96 pcs) packaging | Optimized for automated SMT assembly and high-volume production runs | Select for manufacturing scalability and reduced handling cost in volume production |
Compared with LTC3374HUFE#PBF, the LTC3374EFE#PBF offers lower cost and sufficient thermal margin for most industrial and cabin-grade automotive applications; compared with LTC3374EFE#TRPBF, the tube-packaged version supports prototyping, low-volume builds, and manual rework without reel-handling infrastructure.
Availability
LTC3374EFE#PBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS controllers, 5G baseband units, test equipment, and communications infrastructure requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3374EFE#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains full product support, documentation, and qualification for the LTC portfolio. Linear's legacy expertise in precision power management remains central to ADI's high-performance analog roadmap.
The LTC3374 series was designed to address the growing demand for highly integrated, flexible, and thermally aware multirail power solutions in space-constrained industrial, automotive, and communications systems-replacing discrete buck controllers and reducing design complexity.
FAQ
What is the maximum output current achievable per channel using LTC3374EFE#PBF?
The LTC3374EFE#PBF supports up to 1A per individual buck channel. When configured in master-slave parallel mode-by connecting FBx to VINx-up to four channels can be combined to deliver up to 4A per output rail with a single inductor. The PMOS current limit scales accordingly: 2.3A (2×), 6.9A (3×), or 9.2A (4×) typical.
Does LTC3374EFE#PBF require external compensation components?
No, the LTC3374EFE#PBF features internally compensated buck regulators. Only external feedback resistors are needed to set the output voltage. No external compensation network (e.g., RC, capacitor across FB) is required-simplifying layout and improving stability across load and input conditions.
How does the TEMP pin on LTC3374EFE#PBF function in system thermal management?
The TEMP pin on LTC3374EFE#PBF outputs a linear analog voltage: 150mV at 25°C with a slope of 6.75mV/°C. This allows direct ADC measurement of die temperature without calibration. System firmware can use this data for dynamic frequency scaling, fan control, or early-warning thermal shutdown-enhancing reliability beyond the built-in 165°C overtemperature shutdown.
Can LTC3374EFE#PBF operate with different input voltages on each channel?
Yes, LTC3374EFE#PBF supports independent input supplies (VIN1–VIN8) ranging from 2.25V to 5.5V per channel. This enables heterogeneous power architectures-for example, powering one rail from a 3.3V LDO and another from a 5V buck converter-without cross-coupling or shared input constraints.
What is the purpose of the PGOOD_ALL pin on LTC3374EFE#PBF?
The PGOOD_ALL pin on LTC3374EFE#PBF is an open-drain output that goes LOW whenever the regulated output voltage of *any* enabled buck regulator falls more than 7.5% below its programmed value-or when all regulators are disabled. It serves as a system-level power-fail indicator, enabling simple reset generation or fault logging without monitoring eight separate PGOOD signals.
LTC3374EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 8
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3374EFE#PBF FAQ
1.How can I place an order for LTC3374EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374EFE#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3374EFE#PBF reliable?
The price and inventory of LTC3374EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3374EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374EFE#PBF?
LTC3374EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374EFE#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3374EFE#PBF?
For technical support, including LTC3374EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374EFE#PBF requirements.
6.How does Aetrix verify that LTC3374EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3374EFE#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3374EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3374EFE#PBF?
All LTC3374EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374EFE#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3374EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3374EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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